ALSA: echoaudio: Deletion of a check before release_and_free_resource()

The release_and_free_resource() function tests whether its argument is NULL
and then returns immediately. Thus the test around the call is not needed.

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/echoaudio/echoaudio.c

@@ -1875,8 +1875,7 @@ static int snd_echo_free(struct echoaudio *chip)
 	if (chip->dsp_registers)
 		iounmap(chip->dsp_registers);
 
-	if (chip->iores)
-		release_and_free_resource(chip->iores);
+	release_and_free_resource(chip->iores);
 
 
 	pci_disable_device(chip->pci);